[pulseaudio-tickets] [Bug 97777] Clipping with per-stream volume above 100% even though device volume below 100%

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Sep 13 15:04:02 UTC 2016


https://bugs.freedesktop.org/show_bug.cgi?id=97777

--- Comment #1 from Niklas Haas <bugs.freedesktop at haasn.xyz> ---
An update:

I realized that if I set my device profile in pavucontrol's configuration tab
from “Analog Output” to “Digital Output”, pulseaudio will stop using the
device's built-in output volume adjustment and instead use software volume
adjustment.

This solves #3 of my problem, meaning I can now set my device volume to -10 dB,
and my stream to +10dB, and get no clipping artifacts.

However, it leaves #4 of my issue, which is that out-of-range floats are
clipped by PulseAudio (or if not pulseaudio, then the pulseaudio client). It
does seem like the signal format is to be described as explicitly being in
[-1,1] even for floats in the documentation here:
https://freedesktop.org/software/pulseaudio/doxygen/sample_8h.html#a41051ceaa5cfbe60c9b176deb7bfed0e

Could that restriction be conceivably dropped? I would love to be able to send
out-of-range floats and have PulseAudio mix them without clipping.

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